.308 AR Compatible Builders Lower Receiver Parts Kit Matte Black Finish Includes: LLR-01 Buffer Retainer 1-ea. LLR-02 Buffer Retainer Spring 1-ea. LLR-08 Selector/Safety 1-ea. LLR-09 Bolt Catch Spring 1-ea. LLR-10 Bolt Catch Buffer (Plunger) 1-ea. 308-LR-11 Bolt Catch 1-ea. 308-LR-12 Bolt Catch Screw 1-ea. LLR-13 Magazine catch 1-ea. LLR-14 Detent Spring 2-ea. LLR-15 Takedown Detent 2-ea. LLR-16 Mag Catch/Buttstock Plunger Spring 1-ea. LLR-17 Magazine Catch Button, Aluminum 1-ea. 308-LR-18 Front Pivot Pin 1-ea. LLR-26 Selector/Ejector Spring 1-ea. LLR-27 Detent (Selector) 1-ea. LLR-28 Hammer/Trigger pin 2-ea. 308-LR-30 Pin, Rear Takedown 1-ea. Does not include the fire control group.